Al、Cr及B元素对Fe-Al基耐热合金组织和高温抗氧化性能的影响  

Effects of Al,Cr and B Elements on Microstructure and High Temperature Oxidation Resistance of Fe-Al Based Heat Resistant Alloy

作　　者：张世杰[1] 刘晓丹[1] ZHANG Shi-jie;LIU Xiao-dan(Langfang Technical College of Profession,Langfang 065000,Hebei,China)

机构地区：[1]河北廊坊职业技术学院,河北廊坊065000

出　　处：《铸造》2023年第6期661-666,共6页Foundry

摘　　要：采用正交试验的方法研究了合金元素Al、Cr、B对试验合金组织及高温抗氧化性能的影响规律。结果表明,试验合金室温组织为铁素体和Fe_(2)B,元素B生成新相Fe2B,沿晶界分布。元素Al、Cr一部分固溶于基体,另一部分存在于Fe_(2)B中,没有新相生成。三种合金元素对高温抗氧化性能的影响分别为:增加元素Al的含量,试验合金的高温氧化速率随之降低。当元素Al的含量达到9%时,试验合金形成的Al_(2)O_(3)保护膜达到很好的对基体的保护作用,表现为较好的高温抗氧化性能;增加元素B含量,试验合金的高温氧化速率随之增加。当其含量超过2.0%时,会生成AlBO_(3)和B_(6)O等硼氧化物,抑制Al_(2)O_(3)氧化物的生成,使得试验合金的高温氧化性能越来越差;增加元素Cr含量,试验合金的高温氧化速率逐渐降低,当元素Cr含量达到或超过5%时,会促进Al_(2)O_(3)氧化膜生成,高温抗氧化性能逐渐提高。The effects of Al,Cr,B alloy elements on the microstructure and high temperature oxidation resistance of the tested alloy were studied by orthogonal test.The results showed that the room temperature microstructure of the alloy consisted of ferrite and Fe_(2)B,and the new phase Fe_(2)B was formed from element B and distributed along the grain boundary.Part of Al and Cr elements were solidly dissolved in the matrix,while the other part existed in Fe_(2)B,and no new phase was formed.The effects of the three alloying elements on the oxidation resistance at high temperature were as follows:increasing the content of element Al,the high temperature oxidation rate of the test alloy decreased.When the content of Al element reached 9%,the Al_(2)O_(3)protective film formed by the experimental alloy had a good protective effect on the matrix,showing a good oxidation resistance at high temperature.Increasing the content of element B increased the oxidation rate at high temperature.When the content exceeded 2.0%,boron oxides such as AlBO_(3)and B_(6)O would be formed,which inhibited the formation of Al_(2)O_(3)oxide,making the high temperature oxidation performance of the test alloy worse and worse.Increasing the content of element Cr,the value of high-temperature oxidation rate gradually decreased.When the content of element Cr reached or exceeded 5%,the formation of Al_(2)O_(3)oxide film would be promoted,and the high temperature oxidation resistance would be improved gradually.

关 键 词：耐热合金 正交试验 高温抗氧化性能 氧化增重速率 氧化膜 

分 类 号：TG143.9[一般工业技术—材料科学与工程]